Organic chemistry-some basic principles and techniques practice · Medium

Formulae of phenyl carbinol and chloral are respectively :

Which of the following is the most powerful meta directing group?

During the quantitative analysis of salt cation ${\mathrm{y}^{2 + }},$ addition of a reagent (X) to alkaline solution of the salt gives a bright red precipitate. The reagent (X) and the cation $\left( {{\mathrm{y}^{2 + }}} \right)$ present respectively are:

The most stable free radical is

In which of the following $p -$electrons of the halogens are not involved in delocalisation?

Examples of electron withdrawing groups relative to hydrogen are

The energy of $\mathrm{C}-\mathrm{C}$ triple bond in acetylene in kcal is :

0.4 g of a silver salt of a monobasic orgainc acid gave 0.26 g pure silver on ignition. the molecular weight of the acid is (atomic weight of silver=108)

Which of the following is the strongest base?

The sulphur present in an organic compound is oxidized by fuming nitric acid into:

Assertion (A): The order of stability of carbanion are $\left(\mathrm{C}_6 \mathrm{H}_5\right) \mathrm{C}^{-} > \mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2^{-} > \text {allyl } > \mathrm{CH}_3^{-} > \left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{-}$
Reason (R): The stability of carbanions is influenced by both resonance and inductive effects.

During $\mathrm{AgN}{\mathrm{O}_3}$ test for detection of halogens, sodium extract is boiled with few drops of conc. $\mathrm{HN}{\mathrm{O}_3}$ to decompose

A metal $\mathrm{M}$ and its compound can give the following observable changes in a consequences of reactions

${\text{M}}\xrightarrow[{{\text{HN}}{{\text{O}}_{\text{3}}}}]{{{\text{ dilute }}}}\left[ {\begin{array}{cccccccccccccccccccc} {{\text{ Colourless }}} \\ {{\text{ solutions }}} \end{array}} \right]\xrightarrow[{{\text{NaOH}}}]{{{\text{ aqueous }}}}\left[ {\begin{array}{cccccccccccccccccccc} {{\text{ White }}} \\ {{\text{ precipitate }}} \end{array}} \right]\xrightarrow[{{\text{NaOH}}\left( {{\text{aq}}{\text{.}}} \right)}]{{{\text{excess}}}}\left[ {\begin{array}{cccccccccccccccccccc} {{\text{Colourless}}} \\ {{\text{solutions}}} \end{array}} \right]\xrightarrow{{{{\text{H}}_2}{\text{S}}}}\left[ {\begin{array}{cccccccccccccccccccc} {{\text{ White }}} \\ {{\text{ precipitate }}} \end{array}} \right]$

A compound with molecular formula, ${C_7}{H_{16}}$ shows optical isomerism, the compound will be:

Which one of the following will show optical isomerism?

Assertion: Cyclo hexane floats over water.

Reason: Cyclohexane generally exists as boat conformers.

In which of the following functional group isomerism is not possible?

When thiourea is heated with metallic sodium, the compound which can't be formed is

Metal chloride $A$ is soluble in hot water but insoluble in cold water. Select correct statement about $A$ thus

In Lassaigne's test, the organic compound is fused with a piece of sodium metal in order to

In paper chromatography:

In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of

Which of the following compound chiral?

Halogens in an organic compound can be detected by:

Assertion: The compounds having double bond between carbon atoms always show geometrical isomerism.

Reason: The rotation of groups or atom about carbon-carbon double bond is restricted.

Petroleum refining involves:

Statement I: Diffrent number of electron pairs are present in resonance structures.

Statement II: Resonance structures do not differ in the location of electrons around the constituent atoms.

Statement I : $C{H_3} - \mathop {\mathop {CH}\limits_| }\limits_{OH} - CH = CH - C{H_3}$ compound has three stereocentres
Statement II : Chiral centres have four different C-atoms

Which of the following fact(s) explain as to why p-nitrophenol is more acidic than phenol?
i) –I effect of nitro group
ii) Greater resonance effect of p-nitrophenoxy group
iii) Steric effect of bulky nitro group.

Aqueous solution of a salt $+{MgSO}_4$ solution $\rightarrow$ no ppt. in cold $\xrightarrow{{{\text{Heating}}}}$ a white ppt. appears. The salt contains the acidic radical: